Koj puas paub pH standard buffer solution?
1. Dab tsi yog pH standard buffer tov? Nws cov yam ntxwv yog dab tsi?
Cov tshuaj pH tsis yog ib qho tshuaj uas ua kom tus nqi pH ruaj khov. Yog hais tias ib qho me me ntawm cov kua qaub los yog cov hauv paus ntxiv rau cov tshuaj no, los yog ib qho me me ntawm cov kua qaub los yog lub hauv paus yog tsim los ntawm cov tshuaj tiv thaiv hauv cov tshuaj, thiab cov tshuaj yog diluted kom zoo, pH tus nqi ntawm cov tshuaj yog qhov ruaj khov. Alkali yog loj los yog diluted, thiab cov tshuaj uas ua kom tus nqi pH tsis hloov yog hu ua cov tshuaj tsis haum.
Tus qauv pH tsis muaj cov yam ntxwv hauv qab no:
(1) Tus nqi pH ntawm cov qauv kev daws teeb meem yog paub thiab ncav cuag qhov tseeb;
(2) Tus nqi pH ntawm tus qauv kev daws teeb meem muaj qhov zoo rov ua dua thiab ruaj khov, thiab muaj peev xwm tsis loj, me me dilution nqi thiab me me kub coefficient;
(3) Txoj kev npaj ntawm kev daws yog yooj yim;
2. Yuav ua li cas npaj pH txheem tsis tov? Rau kev ntsuas pH dav dav, ua tiav cov pH reagents (250mL tuaj yeem npaj tau) tuaj yeem siv. Thaum npaj cov tshuaj, cov dej deionized yuav tsum tau siv thiab boil rau 15-30 feeb ua ntej kom tshem tawm cov carbon dioxide yaj. Txiav lub hnab yas thiab ncuav lub reagent rau hauv lub beaker, dissolve nws nrog ib tug tsim nyog tus nqi ntawm deionized dej, yaug lub hnab ntim, ces ncuav rau hauv 250mL volumetric hwj, dilute rau lub cim, thiab co zoo.
3. How to store and use pH buffer solution correctly? After the buffer solution is prepared, it should be packed in a glass bottle or a polyethylene bottle (alkaline pH buffer solution, such as pH=9.18, pH=10.01, pH=12.46, etc., should be packed in a polyethylene bottle) and the cap should be tightly closed , Stored in the refrigerator at low temperature (5-10°C), it can generally be used for about six months. If the mixer is found to be turbid, moldy or precipitated, it cannot be used any longer. When using, several 50mL polyethylene vials should be prepared, pour the group flushing solution in the large bottle into the vials, and place it at ambient temperature for 1 to 2 hours, and then use it after the temperature is balanced. Do not pour it into a large bottle after use to avoid contamination. The buffer solution in the bottle can be used for 2 to 3 days under the environmental conditions of >10 degree. Feem ntau, peb txoj kev daws teeb meem ntawm pH=7.00, pH=6.86, thiab pH=14.00 tuaj yeem siv rau ib qho ntev. Ntev dua, pH tus nqi ntawm pH=9.18 thiab pH=10.01 cov kev daws teeb meem yooj yim dua vim qhov nqus ntawm carbon dioxide hauv huab cua.
4. Kev siv cov tshuaj pH tsis yog dab tsi?
(1) Calibrate thiab calibrate pH meter ua ntej ntsuas pH.
(2) Txhawm rau txheeb xyuas qhov tseeb ntawm pH meter, piv txwv li, siv pH =6 86 thiab pH =14 00, tom qab ntsuas pH ntsuas pH, ntxig rau pH electrode rau hauv pH =9.18 tov, thiab xyuas seb tus nqi tso tawm ntawm qhov ntsuas puas zoo ib yam nrog tus nqi pH ntawm tus qauv tov.
(3) Txheeb xyuas seb lub ntsuas pH puas yuav tsum tau rov ntsuas dua thaum ntsuas qhov tseeb. Tom qab pH ntsuas ntsuas tau ntsuas thiab siv, nws yuav ntws los yog hloov pauv. Yog li ntawd, ua ntej kev ntsuam xyuas, ntxig cov electrode rau hauv cov txheej txheem buffer tov uas nyob ze rau cov tshuaj yuav tsum tau kuaj, thiab txiav txim seb nws yuav tsum tau rov calibrated raws li qhov loj ntawm qhov yuam kev.
(4) Txheeb xyuas qhov ua tau zoo ntawm pH electrode.
